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Finding the Fourth Proportional to 1,338.42, 2,007.65 and 879.12

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Solution

The fourth proportional to 1,338.42, 2,007.65 and 879.12 is: 1,318.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.42 : 2,007.65 = 879.12 : x
  2. Step 2: Convert to fraction form
    1,338.42/2,007.65 = 879.12/x
  3. Step 3: Cross multiply
    1,338.42x = 2,007.65 × 879.12
  4. Step 4: Simplify right side
    1,338.42x = 1,764,965.27
  5. Step 5: Solve for x
    x = 1,764,965.27/1,338.42
  6. Step 6: Final answer
    x = 1,318.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.